Student Challenge: Three Shirts

The friends, Mr. Red, Mr. Blue, and Mr. Black, meet for dinner. One man is wearing a red shirt, the second a blue shirt, and the third a black shirt. One of the friends remarks, "Have you noticed how we're all wearing shirts of a different color from our names?"
The man in the black shirt replies, "Yes, Mr. Blue, you're so right!"

Which man is wearing which shirt?

For a blog point, place your answer in a closed envelope addressed to "Mr. Koch." Put your name and grade as the return address. Deliver it to Mr. Koch at school.

p.s. If you can't find me, your teacher can put it in my mailbox too!
p.p.s. You can add comments, but DON'T reveal your answer in the comments!